Auto merge of #106696 - kylematsuda:early-binder, r=lcnr

Switch to `EarlyBinder` for `const_param_default` and `impl_trait_ref` queries

Part of the work to close #105779 and implement https://github.com/rust-lang/types-team/issues/78.

Several queries `X` have a `bound_X` variant that wraps the output in `EarlyBinder`. This PR adds `EarlyBinder` to the return type of  `const_param_default` and `impl_trait_ref`, and removes their `bound_X` variants.

r? `@lcnr`

compiler/rustc_infer/src/infer/error_reporting/note.rs

@@ -320,6 +320,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             .impl_trait_ref(impl_def_id)
             else { return; };
         let trait_substs = trait_ref
+            .subst_identity()
             // Replace the explicit self type with `Self` for better suggestion rendering
             .with_self_ty(self.tcx, self.tcx.mk_ty_param(0, kw::SelfUpper))
             .substs;